The World Bank warns that a 4 degree C global temperature increase would devastate the world’s economy

“A 4 degree Celsius world is so different from the current one that it comes with high uncertainty and new risks that threaten our ability to anticipate and plan for future adaptation needs,” he writes.

A global temperature increase like one estimated by the World Bank would lead to “the inundation of coastal cities; increasing risks for food production, potentially leading to higher malnutrition rates; many dry regions becoming dryer, wet regions wetter; unprecedented heat waves in many regions,” water scarcity, and more natural disasters.